Framing an image can be so effective in photography. To frame an image, you simply crop it or frame it with an effective border in order to make your image strong. In the bird image, you can see how the bird is cropped in order to match the rule of thirds. Also it takes out the background which can cause too much attention, making you focus on the main subject.
Irving Penn
An artist that uses framing to create her images is Irving Penn. He crops his images to focus on the portraits so that it can get emotions across to the audience.